Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9ff1fd41eb016…

MALICIOUS

PDF

52.3 KB Created: 2020-08-29 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ac4b09b4718aca9743b9a3e95b80f5 SHA-1: 2dfd24bb7389b05de3d593d5885637151f75c896 SHA-256: 42e9ff1fd41eb0168b19e9baefe49188c376370236bc4a9c81f65db7c330f46e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a critical heuristic firing for a PDF link to known malicious redirector infrastructure. It also contains a large number of embedded links, characteristic of a link farm, with the primary redirector URL being https://ttraff.club/wix?keyword=quantum+dot+vs+oled. The document body itself is heavily obfuscated and contains this URL along with numerous other PDF links hosted on static.usrfiles.com.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=quantum+dot+vs+oled
    • https://static.usrfiles.com/ugd/b8c837_e61ca8ca5bbe4d16a1c09b3faeaadb92.pdf
    • https://static.usrfiles.com/ugd/2c608b_20039657da0d417ab80b78dd87db3cbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8216fa7f4c494031a922782d5f4b366f.pdf
    • https://static.usrfiles.com/ugd/b8c837_09c242601dc44113a5272e24008559f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2986a01e740a42bebdd0852c6651dd67.pdf
    • https://static.usrfiles.com/ugd/b8c837_b67014d539ea4db3bcd7b30ca35ce6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b0760ebcf8242cf9a594d4b66f2709a.pdf
    • https://static.usrfiles.com/ugd/12f4eb_f094ecad00aa4ffab8745b210e383282.pdf
    • https://static.usrfiles.com/ugd/6da380_dbc270d357c84b139a053ef2de7c6d97.pdf
    • https://static.usrfiles.com/ugd/b8c837_efff9e2596804dcc8eaa913fca07941e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f20a658b6594a728d1e632be534843f.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b0291f9c78495bab1a7d9d37955ae1.pdf
    • https://static.usrfiles.com/ugd/b65acf_971753a08c1040e19f0e554580ccd428.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ae8e67454aa888573520db37d1a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_59576f33e5104edd9ab1cbd62367a1f5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d0d.bin
77731eafe6a69c0ecc259185aa27ceb7908a5de05e237c622cc4b813c1749c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 4996 bytes
font_01_sfnt_off00009dfe.bin
3b28152726ecfe3d3ce90b1c04bff7ab278fede2922c9d0051e5b2f6c0a47922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFE 11956 bytes

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